As promised, here come the animals to populate the fen quilt.  
My friend, as I said earlier, specified particular species of each animal.  It wasn't hard to find photos of each via google.  I also found info on each animal's size, so I could reproduce them somewhat in scale.  
I put each photo into Illustrator (I imagine any program would work somewhat the same, but I'm nowheres near a computer expert).  I drew a box the size I wanted the animal to be, and scaled the photo accordingly.  Then I printed them out, traced each onto paper, pinned them on the quilt, and checked it out with my friend.  I posted a photo of the quilt with paper animals in place in a 
previous post.
When the sizing was all set, I used the tracings as patterns to cut the fabrics for the basis of each animal.  Again, the fabrics were all stabilized with iron-on interfacing before I cut.  I stitched the animals in place, using a zig-zag with invisible thread.